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Abstract

2D photonic crystal (2D PC) structures consisting in a square lattice of Indium Phosphide (InP) microrods bonded on a Silicon/Silica Bragg mirror are experimentally investigated. We focus on slow Bloch modes above the light line, especially at the Γ-point where a vertical emission can be obtained. Stimulated emission around 1.5µm is demonstrated in such structures, at room temperature, for the first time. In addition the achieved threshold power lies within the range reported for surface emitting devices based on conventional lattices of holes. It is shown that the laser mode is laterally confined by a carrier induced refractive index change, under pulsed excitation. It is also demonstrated that this type of 2D PC is well suited for sensors integrated in microfluidic sytems.

(a) Cross-section of the studied structures (b) Reciprocal space and band diagram (TE polarization) for a square lattice of dielectric rods embedded in silica (filling factors 50%): the studied A1 SBM is circled and its electric field intensity distribution is also given.

Experimental setup (F1 is the microscope objective focal length, F2 is the focal length of the achromatic lens L2): (a) Fourier space imaging of the light emitted from the sample; one emission direction corresponds to one point (kx,ky) on the image. (b) Real space imaging of the photoluminescence intensity emitted from the sample.